Embolic basket

Abstract

An intravascular basket device for use in capturing either naturally occurring or foreign debris found in blood vessels or other regions of the body. The basket device is fabricated from a tube and includes a mid-section having at least one ring configured in an alternating V-pattern. The basket device specifically embodies structure that provides enhanced radial opening and angular resistance to collapse.

What is claimed is: 
     
       1. A medical retrieval device for use in a patient's vasculature, comprising:
 an elongate member having a proximal end and a distal end; 
 a body attached to the distal end of the elongate member which is configured to engage or capture material found in the vasculature, the body including a distally directed extension; and 
 a distal tip portion including a first coil and a second coil which coaxially extend over the distally directed extension of the body. 
 
     
     
       2. The device of  claim 1 , wherein the first coil is made from nitinol. 
     
     
       3. The device of  claim 1 , wherein the second coil is made from an alloy made from about 90% platinum and about 10% iridium. 
     
     
       4. The device of  claim 1 , further including a weld which connects the distally directed extension to the first coil. 
     
     
       5. The device of  claim 1 , further including a second distally directed extension which has the first and second coils coaxially disposed thereover. 
     
     
       6. The device of  claim 5 , wherein the first distally directed extension has longitudinal length which is longer than the longitudinal length of the second distally directed extension. 
     
     
       7. The device of  claim 1 , wherein the first coil has a longitudinal length and the second coil has a longitudinal length, the longitudinal length of the first coil being shorter that the longitudinal length of the second coil. 
     
     
       8. The device of  claim 7 , wherein the second coil is coaxially disposed over at least a portion of the first coil. 
     
     
       9. The device of  claim 8 , wherein the distal end of the first coil is located proximal to the distal end of the second coil. 
     
     
       10. The device of  claim 9 , wherein the first coil is made from nitinol. 
     
     
       11. The device of  claim 10 , wherein the second coil is made from an alloy made from about 90% platinum and about 10% iridium. 
     
     
       12. The device of  claim 1 , wherein at least a portion of the body extends distally from the distal end of the elongate member.